1. Division of Cardiovascular Disease, Department of Internal Medicine; Faculty of Medicine Ramathibodi Hospital, Mahidol University; Bangkok Thailand
2. Department of Internal Medicine; Buriram Hospital; Buriram Thailand
3. Department of Internal Medicine; Queen Savang Vadhana Memorial Hospital; Chonburi Thailand
4. Division of Cardiology, Department of Internal Medicine, College of Medicine; Prince Songkla University; Songkhla Thailand